All models
OpenAI
GPT 5.1 Codex
GPT-5.1 tuned for agentic coding in OpenAI's Codex: long edit, run and fix loops across real repositories, with 400K context. Fair value for code at its price. Less suited to open-ended chat or writing, and the newer GPT-6.1 Sol has moved past it.
MainstreamThe big labs' models with their own safety filters. Best for work, code and research.
Brilliant
Intelligence
~4.55 credits
Estimated price per message
400K tokens
Context window
Text, Images
Reads
GPT 5.1 Codex is a legacy model. Its successor, GPT-6.1 Sol, is faster or cheaper - and chats that used GPT 5.1 Codex move to it automatically.
See GPT-6.1 SolThe facts
Made by
OpenAI
Content tier
MainstreamThe big labs' models with their own safety filters. Best for work, code and research.
Intelligence
Brilliant
Estimated price per message
~4.55 credits≈ 21 messages for $1
Context window
400K tokens≈ 615 pages of text in one go
Reads
Text, Images
Writes
Text
Tool use
Yes - search, memory, code and more
Served via
OpenRouter, Unbottled AI
Status
Legacy
A typical message: 16K tokens in, 1.5K out. Short replies cost less. Models served via OpenRouter bill the real provider cost plus our markup, so actual charges vary. 1 credit = $0.01.
Compare GPT 5.1 Codex
Same facts, side by side.
Try GPT 5.1 Codex now.
No subscription. Free credits to start. The chat opens with GPT 5.1 Codex selected and a prompt ready - just send.